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1. WO2000017442 - METHOD FOR BLEACHING MECHANICAL PULP

Publication Number WO/2000/017442
Publication Date 30.03.2000
International Application No. PCT/CA1999/000239
International Filing Date 22.03.1999
IPC
D21C 9/10 2006.01
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10Bleaching
D21C 9/16 2006.01
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
10Bleaching
16with per compounds
CPC
D21C 9/1047
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
10Bleaching ; ; Apparatus therefor
1026Other features in bleaching processes
1047Conserving the bleached pulp
D21C 9/163
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
10Bleaching ; ; Apparatus therefor
16with per compounds
163with peroxides
Applicants
  • QUEEN'S UNIVERSITY AT KINGSTON [CA]/[CA] (AllExceptUS)
  • WAN, Jeffrey, K.-S. [CA]/[CA] (UsOnly)
  • DEPEW, M., Catherine [CA]/[CA] (UsOnly)
Inventors
  • WAN, Jeffrey, K.-S.
  • DEPEW, M., Catherine
Agents
  • STEEG, Carol, Miernicki
Priority Data
PCT/CA98/0091821.09.1998CA
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR BLEACHING MECHANICAL PULP
(FR) PROCEDE DE BLANCHIMENT DE LA PATE MECANIQUE
Abstract
(EN)
A method for bleaching unbleached softwood or hardwood pulps using hydrogen peroxide without added alkali for activation is described. The aqueous hydrogen peroxide solution contains an alkaline earth metal carbonate, preferably magnesium carbonate and can be used at elevated temperatures. Bleached hardwood or softwood mechanical pulps with high brightness, low yellowness (b*) and reduced reversion properties are produced.
(FR)
L'invention porte sur un procédé de blanchiment de pâte de bois résineux et de pâte de feuillus non blanchies au moyen de peroxyde d'hydrogène, sans ajout d'alcali pour l'activation du processus. La solution aqueuse de peroxyde d'hydrogène, qui contient du carbonate de métal alcalino-terreux, de préférence du carbonate de magnésium, peut être exposée à de hautes températures. Ce procédé permet de produire des pâtes mécaniques blanchies de bois de conifères et de feuillus présentant un degré élevé de blancheur, un faible jaunissement (b*) et qui foncent moins lorsqu'elles sont exposées à la lumière.
Also published as
US09574236
Latest bibliographic data on file with the International Bureau